JPH0974495A - Display device - Google Patents
Display deviceInfo
- Publication number
- JPH0974495A JPH0974495A JP7227709A JP22770995A JPH0974495A JP H0974495 A JPH0974495 A JP H0974495A JP 7227709 A JP7227709 A JP 7227709A JP 22770995 A JP22770995 A JP 22770995A JP H0974495 A JPH0974495 A JP H0974495A
- Authority
- JP
- Japan
- Prior art keywords
- screen
- signal
- power
- microcomputer
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Details Of Television Scanning (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はテレビジョン受信機をは
じめとするＣＲＴディスプレイ装置において、電源ＯＦ
Ｆ時の高圧残りを防止する手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply OF in a CRT display device such as a television receiver.
The present invention relates to a means for preventing high pressure remaining at F time.
【０００２】[0002]
【従来の技術】従来、テレビジョン等のＣＲＴにおい
て、電源ＯＦＦ時のＣＲＴの高圧残り防止手段は、電源
ＯＦＦ時に映像信号の輝度レベルを上げる回路を用意し
ておき、電源ＯＦＦ時に画面輝度を上げることによりＣ
ＲＴに残るエネルギー消費させ、高圧残りを防いでい
る。2. Description of the Related Art Conventionally, in a CRT such as a television, a means for preventing high voltage remaining in the CRT when the power is turned off has a circuit for increasing the brightness level of a video signal when the power is turned off, and increases the screen brightness when the power is turned off. By C
It consumes the energy remaining in the RT and prevents the residual high pressure.
【０００３】以下、従来の高圧残り防止回路を図２によ
って説明する。図２は従来の高圧残り防止回路の回路ブ
ロック構成図を示す。図２において、符号２は電源ＯＦ
Ｆ検出回路、４はマイコン、７は映像処理ＩＣを示す。
次に、上記構成の回路動作について説明する。A conventional high voltage residual prevention circuit will be described below with reference to FIG. FIG. 2 shows a circuit block diagram of a conventional high voltage residual prevention circuit. In FIG. 2, reference numeral 2 is a power source OF
F detection circuit, 4 is a microcomputer, and 7 is a video processing IC.
Next, the circuit operation of the above configuration will be described.
【０００４】電源ＯＮ時はトランジスタ１０がＯＦＦ状
態になっており、コンデンサ１１が充電される状態にあ
る。電源がＯＦＦとなった時、トランジスタ１０はＯＮ
状態となりコンデンサ１１に充電されていた電荷がトラ
ンジスタ１０を通じて流れ出し、映像処理ＩＣ７の黒レ
ベル調整端子に流れ込み、黒レベル調整を最大にするこ
とにより上記のような動作を行なう。When the power is on, the transistor 10 is off and the capacitor 11 is in a charged state. When the power is turned off, the transistor 10 turns on
In this state, the electric charge charged in the capacitor 11 flows out through the transistor 10, flows into the black level adjustment terminal of the image processing IC 7, and the black level adjustment is maximized to perform the above operation.
【０００５】また、特開平４−６３０６７号公報におけ
る構成も同様の効果をねらったもので、図３によって説
明する。図３は従来の表示装置の構成回路図を示す。図
３において、リモコン等を用いて電源ＯＦＦ操作をする
と、スイッチ回路５がＯＦＦ状態となり、加算回路４に
おいて映像信号ＳV 中の輝度信号ＳY に重畳されていた
直流出力Ｂ1 が供給されなくなる。これにより、輝度信
号ＳY は白レベルになり、これを維持する。これに対
し、水平発振回路１２においては、スイッチ回路５がＯ
ＦＦ状態となった時点から抵抗Ｒ２およびコンデンサＣ
２によって決められる時定数分だけ遅れて電源Ｂ1 から
の給電が停止する。従って、その間ビーム電流が増加し
た白い画像が表示され、ブラウン間に残るエネルギーを
消費させ、スポット残りを発生させないようにすること
ができる。The structure disclosed in Japanese Patent Laid-Open No. 4-63067 aims at the same effect and will be described with reference to FIG. FIG. 3 shows a circuit diagram of a conventional display device. In FIG. 3, when the power is turned off using a remote controller or the like, the switch circuit 5 is turned off, and the DC output B1 superimposed on the luminance signal SY in the video signal SV is not supplied in the adding circuit 4. As a result, the brightness signal SY becomes a white level and is maintained at this level. On the other hand, in the horizontal oscillation circuit 12, the switch circuit 5 is
Resistor R2 and capacitor C from the time when the FF state is entered
The power supply from the power source B1 stops after a delay of the time constant determined by 2. Therefore, a white image in which the beam current is increased during that time is displayed, and the energy remaining in the brown can be consumed to prevent the spot remaining.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
方法では、画面ＯＦＦ時の映像信号の黒レベル調整を最
大にする回路を必要とする。However, the above method requires a circuit for maximizing the black level adjustment of the video signal when the screen is off.
【０００７】本発明は、テレビジョン受信機等に組み込
まれているマイコンを利用し、電源ＯＦＦ時の高圧残り
を防止する装置を提供することを目的とする。An object of the present invention is to provide a device for preventing a high voltage remaining when a power source is turned off by using a microcomputer incorporated in a television receiver or the like.
【０００８】[0008]
【課題を解決するための手段】本発明は上記問題を解決
するために、電源ＯＦＦ時にディスプレイ装置に内蔵さ
れているマイコンよりオンスクリーン信号を出力させ、
このオンスクリーン信号を画面に表示することで高圧残
りを防止するものである。In order to solve the above problems, the present invention outputs an on-screen signal from a microcomputer incorporated in a display device when the power is turned off.
By displaying this on-screen signal on the screen, the residual high voltage is prevented.
【０００９】[0009]
【作用】本発明によれば、上記構成のようにマイコンの
オンスクリーン信号を使用して電源ＯＦＦ時の画面輝度
を上げる為、電源ＯＦＦ時に映像信号の黒レベル調整を
最大にする回路が不要となる。According to the present invention, since the on-screen signal of the microcomputer is used to increase the screen brightness when the power is turned off as in the above configuration, a circuit for maximizing the black level adjustment of the video signal when the power is turned off is unnecessary. Become.
【００１０】[0010]
【実施例】以下、本発明の一実施例におけるディスプレ
イ装置を図１によって説明する。図１は本発明の一実施
例におけるディスプレイ装置のブロック構成図を示す。
図１において、符号２は電源ＯＦＦ検出回路、４はマイ
コン、７は映像処理ＩＣ、８は切り替え回路を示す。次
に、上記構成の回路動作について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to an embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram of a display device according to an embodiment of the present invention.
In FIG. 1, reference numeral 2 is a power OFF detection circuit, 4 is a microcomputer, 7 is a video processing IC, and 8 is a switching circuit. Next, the circuit operation of the above configuration will be described.
【００１１】リモコン信号１がマイコン４に入力され
る，または本体電源スイッチのＯＦＦなど電源ＯＦＦ検
出回路２により、電源ＯＦＦ信号３がマイコン４に入力
されると、マイコン４は画面全体が全白となるようなオ
ンスクリーン信号５を出力する。When the remote control signal 1 is input to the microcomputer 4 or the power OFF signal 3 is input to the microcomputer 4 by the power OFF detection circuit 2 such as when the main body power switch is turned OFF, the entire screen of the microcomputer 4 turns white. Then, the on-screen signal 5 is output.
【００１２】映像処理ＩＣ７のなかに組み込まれている
切り替え回路８により、それまでの映像信号６からオン
スクリーン信号５に切り替える。よってＣＲＴドライブ
回路９によって画面には全白信号が表示される。A switching circuit 8 incorporated in the video processing IC 7 switches from the video signal 6 thus far to the on-screen signal 5. Therefore, the CRT drive circuit 9 displays an all-white signal on the screen.
【００１３】このマイコン４によって出力された全白の
オンスクリーン信号５を映像信号として画面表示するこ
とにより、従来の映像ＯＦＦ時の映像信号の黒レベル調
整を最大にする回路を利用することなく画面を強制的に
明るくすることと同じ効果を発揮できる。その結果、ブ
ラウン管に残るエネルギーを消費させ、高圧残りを防止
する。By displaying the all-white on-screen signal 5 output from the microcomputer 4 as a video signal on the screen, the screen can be displayed without using the conventional circuit for maximizing the black level adjustment of the video signal when the video is turned off. You can achieve the same effect as forcibly brightening. As a result, the energy remaining in the cathode ray tube is consumed and high pressure residue is prevented.
【００１４】尚、本発明は上記実施例に限定されるもの
ではなく、本発明の主旨に基づいて種々の変形が可能で
ありこれらを本発明の範囲から排除するものではない。The present invention is not limited to the above embodiments, and various modifications can be made based on the gist of the present invention, and these modifications are not excluded from the scope of the present invention.
【００１５】[0015]
【発明の効果】以上のように本発明のディスプレイ装置
によれば、テレビジョン受信機等に組み込まれている既
存のマイコンを用いることにより、電源ＯＦＦ時の映像
をつくりブラウン管の高圧残りを防止できる。その結
果、電源ＯＦＦ時において映像信号の黒レベル調整を最
大にする回路を不要とする。As described above, according to the display device of the present invention, by using the existing microcomputer incorporated in the television receiver or the like, it is possible to form an image when the power is off and prevent the high voltage remaining of the cathode ray tube. . As a result, a circuit for maximizing the black level adjustment of the video signal when the power is off is unnecessary.
【図１】本発明の一実施例におけるディスプレイ装置の
要部ブロック構成図FIG. 1 is a block diagram of a main part of a display device according to an embodiment of the present invention.
【図２】従来の高圧残り防止回路のブロック構成図FIG. 2 is a block configuration diagram of a conventional high voltage residual prevention circuit.
【図３】従来の表示装置の回路構成図FIG. 3 is a circuit configuration diagram of a conventional display device.
２ 電源ＯＦＦ検出回路 ４ マイコン ７ 映像処理ＩＣ ８ 切り替え回路 2 Power OFF detection circuit 4 Microcomputer 7 Video processing IC 8 Switching circuit
Claims (2)
信号を出力して画面を明るくさせ、ＣＲＴに残るエネル
ギーを消費させることを特徴とするディスプレイ装置。1. A display device which outputs a high-brightness on-screen signal when the power is turned off to brighten the screen and consumes the energy remaining in the CRT.
クリーン信号を出力することを特徴とする請求項１記載
のディスプレイ装置。2. The display device according to claim 1, wherein a high-luminance on-screen signal is output by a built-in microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7227709A JPH0974495A (en) | 1995-09-05 | 1995-09-05 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7227709A JPH0974495A (en) | 1995-09-05 | 1995-09-05 | Display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0974495A true JPH0974495A (en) | 1997-03-18 |
Family
ID=16865129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7227709A Pending JPH0974495A (en) | 1995-09-05 | 1995-09-05 | Display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0974495A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6900830B2 (en) | 2000-11-07 | 2005-05-31 | Funai Electric Co., Ltd. | CRT display device with improved resistance to spot bun |
-
1995
- 1995-09-05 JP JP7227709A patent/JPH0974495A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6900830B2 (en) | 2000-11-07 | 2005-05-31 | Funai Electric Co., Ltd. | CRT display device with improved resistance to spot bun |
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